REST API Design Best Practices

Well-designed APIs are crucial for building maintainable and scalable applications. Let's explore best practices for REST API design.

Resource Naming

Use nouns, not verbs. Use plural forms for collections:

Good: GET /users, GET /users/123, GET /users/123/orders
Bad:  GET /getUsers, GET /user/123, GET /getUserOrders

HTTP Methods

Use appropriate HTTP methods for operations:

Status Codes

Use proper HTTP status codes:

200 OK - Successful GET, PUT, PATCH
201 Created - Successful POST
204 No Content - Successful DELETE
400 Bad Request - Invalid request
401 Unauthorized - Authentication required
403 Forbidden - No permission
404 Not Found - Resource doesn't exist
422 Unprocessable Entity - Validation errors
500 Internal Server Error - Server error

Versioning

Include API version in URL:

/api/v1/users
/api/v2/users

Pagination

For large collections, implement pagination:

GET /users?page=2&limit=20
Response:
{
  "data": [...],
  "pagination": {
    "page": 2,
    "limit": 20,
    "total": 150,
    "totalPages": 8
  }
}

Filtering, Sorting, Searching

Filter
GET /users?status=active&role=admin
Sort
GET /users?sort=-createdAt,name
Search
GET /users?search=john

Error Handling

Return consistent error format:

{
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid input data",
    "details": [
      {
        "field": "email",
        "message": "Invalid email format"
      }
    ]
  }
}

Authentication

Use standard authentication methods:

Authorization: Bearer 
X-API-Key: